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Operating expenses - Fees for services, maintenance, materials and supplies (Details) - ARS ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating expenses |  |  |
Maintenance of hardware and software | $ (671) | $ (546) | $ (331)
Technical maintenance | (1,393) | (1,329) | (854)
Service connection fees for fixed lines and Internet lines | (600) | (267) | (224)
Service connection fees capitalized as SAC (Note 3.i) | 23 | 14 | 14
Service connection fees capitalized as Intangible assets (Note 3.i) | 50 | 41 | 36
Other maintenance costs | (716) | (524) | (396)
Obsolescence of inventories - Mobile Services (Note 7) | (17) | (45) | (38)
Call center fees | (1,999) | (1,428) | (1,297)
Other fees for services | (1,211) | (862) | (793)
Directors and Supervisory Committee's fees | (66) | (60) | (36)
Total fees for services, maintenance, materials and supplies | $ (6,600) | $ (5,006) | $ (3,919)

X
- Definition The amount of expense arising from call center fees. + References No definition available. + Details
Name: | teo_CallCenterFees
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense arising from directors and supervisory committee's fees. + References No definition available. + Details
Name: | teo_DirectorsAndSupervisoryCommitteesFees
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | teo_DisclosureOfOperatingExpensesAbstract
Namespace Prefix: | teo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of expenses for fees for services, maintenance, materials and supplies. + References No definition available. + Details
Name: | teo_FeesForServicesMaintenanceMaterialsAndSuppliesExpense
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense arising from hardware and software maintenance. + References No definition available. + Details
Name: | teo_MaintenanceOfHardwareAndSoftware
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense arising from mobile services, obsolescence of inventories. + References No definition available. + Details
Name: | teo_MobileServicesObsolescenceOfInventories
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense arising from other fees for services. + References No definition available. + Details
Name: | teo_OtherFeesForServices
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense arising from other maintenance costs. + References No definition available. + Details
Name: | teo_OtherMaintenanceCosts
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of service connection fees capitalized as intangible assets. + References No definition available. + Details
Name: | teo_ServiceConnectionFeesCapitalizedAsIntangibleAssets
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of service connection fees capitalized as Subscriber Acquisition Costs. + References No definition available. + Details
Name: | teo_ServiceConnectionFeesCapitalizedAsSubscriberAcquisitionCosts
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of expense arising from service connection fees for fixed lines and internet lines. + References No definition available. + Details
Name: | teo_ServiceConnectionFeesFixedLinesAndInternetLines
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense arising from technical maintenance. + References No definition available. + Details
Name: | teo_TechnicalMaintenance
Namespace Prefix: | teo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration